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T-REX 600 › Smoked it!
11-26-2006 08:23 PM  11 years agoPost 1
catfight

rrKey Veteran

USA

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Did high speed straight up climb after about 2 min of gentle 8's - saw purple smoke on descent (about 15' altititude), and when I got it autoed to the ground the ESC burst into flame! Motor still measured 229 degress F after I got it back in the house in about 5 minutes! ESC is charred pile of junk!!! Stopped the blades by hand- unplugged batts and ripped out the Flaming ESC. Saved everything (except ESC and maybe motor)

Should I trust the motor any more after this? Is there any known general reason for this? It has been a fine flying bird for the last 30 flights or so....

What goes up must come around

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11-26-2006 08:39 PM  11 years agoPost 2
Jason Bell

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California

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You must of had the old speed control CF(aka catch on fire) the new onewill not do this, i think it is the X or CX something like that. i dont know i dont have one.

AMain.com
Mikado "V Team"
Xnova Motors
Optipower USA
RCProPlus

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11-26-2006 08:58 PM  11 years agoPost 3
catfight

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USA

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torkboy,

I thought it was a newer version - how do you tell? Label says RCE-BL75G.

What goes up must come around

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11-26-2006 09:15 PM  11 years agoPost 4
twdatsun

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Peoria, AZ

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Does it have the heat sink?

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11-26-2006 09:19 PM  11 years agoPost 5
catfight

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USA

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twdatsun,

Yes it does - is that the indicator? I assume you mean the aluminum plate with the raised area on it?

Thanks

What goes up must come around

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11-26-2006 09:21 PM  11 years agoPost 6
catfight

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USA

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Just looked at the motor windings under a magnifier - fried also

What goes up must come around

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11-26-2006 09:24 PM  11 years agoPost 7
EKIM

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Long Island New York

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This is the old version with no heat sink

*******Mike********

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11-26-2006 09:27 PM  11 years agoPost 8
Raptor Rulezzz

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Rockanje, Zuid-Holland - The Netherlands

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I've been pushing the old type controller HARD for 35 flights now and no problems yet... it stays COOL, even after pulling peaks of 116amps and around 70amps average.

I think you just had a case of bad luck OR your motor already started demagnetizing, making it pull VERY high amps... killing the speed controller.

Exactly the reason why I mounted a DPR100 on my bird. I'm monitoring each flight and I can tell in an instant if the motor/battery is going bad.

Cheers,

Richard



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl

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11-26-2006 09:28 PM  11 years agoPost 9
catfight

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USA

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Ekim,

Mine didn't look like that- thanks for the info! Of course new or old doesn't help at this stage of the game! Just checked motor windings under magnification - fried bad! Align electrics are not impressing me

Think I will switch over to CC HV85 with A123 cells (10S). Anyone have motor recommendations for this combo?

What goes up must come around

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11-26-2006 09:33 PM  11 years agoPost 10
EKIM

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Long Island New York

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...

*******Mike********

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11-26-2006 09:38 PM  11 years agoPost 11
Jason Bell

rrElite Veteran

California

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doesnt the new ersion just have a metal plate for a heat sink?

AMain.com
Mikado "V Team"
Xnova Motors
Optipower USA
RCProPlus

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11-26-2006 09:42 PM  11 years agoPost 12
Jason Bell

rrElite Veteran

California

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well im guessing this is the new version of the esc, it says heat sink.

http://modefosheli.com/inc/sdetail/55823

but it says G on it like the one pictured above? I could of swore they changed the letters.

AMain.com
Mikado "V Team"
Xnova Motors
Optipower USA
RCProPlus

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11-26-2006 09:42 PM  11 years agoPost 13
twdatsun

rrApprentice

Peoria, AZ

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Mine has the metal finned heat sink. Haven't had any problems yet.

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11-26-2006 09:45 PM  11 years agoPost 14
catfight

rrKey Veteran

USA

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raptor,

I have an Eagletree recorder but don't leave it connected all of the time. I am not sure there was any indication of a long term problem -just instant flame! This is the second one I have seen - a friend had his flameout on first run-up also...

Using the FP 4900 batts but only doing aerobatics so far so should not be demagnitizing- also always watch batt and do timed flights.. Must be bad luck

What goes up must come around

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11-26-2006 10:07 PM  11 years agoPost 15
ancientaviator

rrNovice

Melbourne, Australia

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I added a couple of Radio Shack heat sinks using heatsink compound on top of the Align ESC heat sink. I also made sure there is an air gap between the ESC and the frame. No problems so far doing very mild flying. The ESC keeps very cool.

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11-26-2006 10:15 PM  11 years agoPost 16
Jon the Rooster

rrElite Veteran

Johns Island, Charleston, SC

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ancientaviator
Nice Heatsink!
Sorry about the BQ catfight, at least it was minimal Damage!!

and one more thing "DON'T BE AFRAID!"

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11-27-2006 08:05 AM  11 years agoPost 17
Raptor Rulezzz

rrKey Veteran

Rockanje, Zuid-Holland - The Netherlands

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I added a couple of Radio Shack heat sinks using heatsink compound on top of the Align ESC heat sink. I also made sure there is an air gap between the ESC and the frame. No problems so far doing very mild flying. The ESC keeps very cool.
I'm doing hard 3D, 11t straight pinion, 100% curves and +/-14 and mine stays cool also. I got the "old" esc without the headsink

The headsink isn't really neede imho and it doesn't solve the problem of the esc's failing because they didn't change ANYTHING inside the esc, they only added a heatsink...

Cheers,

Richard



Proud Member of Team QuickUK, Team Duralite & Sponsored by V-blades & 4rc.nl

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11-27-2006 11:46 AM  11 years agoPost 18
SSN Pru

rrElite Veteran

Taxachusetts

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The headsink isn't really neede imho and it doesn't solve the problem of the esc's failing because they didn't change ANYTHING inside the esc, they only added a heatsink...
the heatsink lowers the operating temperature of the transistors in the controller. there is no need to change anything in the controller. the reason they were failing is because the amperage running through them was causing the fets to heat up far too high. the heatsink alleviated this condition so there was no need to change the design.

pru

Stupidity can be cured. Ignorance is for life!

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11-28-2006 11:52 PM  11 years agoPost 19
mantis31

rrNovice

Kingsburg, California-Fresno

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Don't feel too bad catfight. I smoked mine last week after just throttling the thing up. The helicopter hasn't even had one full flight on it yet. I don't think I will be using the Align esc's anymore. I am going to upgrade to a higher amp speed controller for sure. Almost makes me want to go back to my Raptor.

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02-17-2007 10:31 PM  11 years agoPost 20
lovetofly

rrApprentice

Dallas, TX - USA

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Something to keep in mind about ESC's:

They run coolest when used at 100% throttle curves. It's the switching, for the most part, that makes them hot. Using them at high current, and less than full power really heats them up fast.

Now of course, if you're pulling too much current, they can burn up either way...but high current AND switching (less than 100% power) will definately kill it the fastest.

I'm using a stock Align ESC w/heatsink, 11T helical, 600XL, and 100% curves. No problems yet, but this system hardly gets warm anyway. Will try 12T helical soon.

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